The Ur-Dragon

Overview

The Ur-Dragon is a discount engine that pays you to attack. Its Eminence shaves off every other Dragon spell — and it does this from the command zone, so your Dragons are cheaper before you ever spend nine mana to cast the commander itself. Stack that discount with Sarkhan, Morophon, Dracogenesis, and Rivaz and the whole tribe deploys a turn or two ahead of curve.

That's the front half. The back half is the attack trigger: whenever one or more Dragons you control attack, you draw that many cards, then put a permanent from your hand onto the battlefield. A five-Dragon swing draws five and drops a free bomb — usually a Dragon you'd otherwise hardcast for seven, or an engine enchantment like Aggravated Assault. Each attack refills your hand and your board, so the next attack is wider, which draws more, which cheats more. Left alone, the deck snowballs out of control on its own attack step.

You win by attacking with a sky full of Dragons. That is not the fallback — that is the deck, and it's the reason to play it. In practice the games end with a wide flying board turned sideways, not with a combo turn. Build the board, hand every Dragon double strike with Atarka, add reach with Dragon Tempest's per-Dragon pings, and the table simply can't race a hand that refills itself every combat. Go wide, then go tall — that's the game you're trying to have.

Keep commander damage as a quiet second clock underneath it. You don't build around this, but you should always know the number, because it closes games the table forgot to count. Ur-Dragon is a 10/10 flier, so it's three unblocked connects on its own — with Atarka giving it double strike that's 20 in a single swing, and one point of anything else finishes it. Under Morophon naming Dragon it swings for 22, a one-shot commander kill, and Garruk's Uprising trample means a chump block doesn't save them. Usually this just means the player you've been hitting with the team is closer to dead than they realize — take it when it's there, but the wide attack is still the plan.

The deck also packs four explosive finishers, and they are real — but treat them as the games that end early, not the plan you steer toward:

• Dragon Tempest + Ancient Gold Dragon dumps a lethal wall of pings across the table off one connect. This one genuinely shows up and genuinely wins — it's the deck's signature.
• Aggravated Assault turns any of three mana-Dragons (Savage Ventmaw, Old Gnawbone, Ancient Copper Dragon) into an infinite or runaway chain of combat phases — and every extra combat is another Ur-Dragon draw-and-cheat. It's the rarer finish: strong when it assembles, but you should not pass up a lethal attack waiting for it.

Read the table, but bias toward attacking: durdle a slow pod under a mounting Dragon board and grind it out with card advantage, and take the Aggravated Assault turn when the pieces arrive rather than building your turns around finding them.

Colors: Green and Red are the pinch. Both sit around 26% of your pip demand and both run slightly under-sourced, while White is over-sourced (it carries protection and premium removal, which you need in smaller quantities). Green holds the ramp and the mana-Dragons; Red holds the combo halves and the cheat/haste package. A green-and-red opener is the one you want; a white-heavy hand short on those two is a mulligan.

Mulligan Guide

The keep question is "can you ramp into cheap Dragons and start swinging — and can you do something when they connect?" You are almost never hardcasting the commander early, and you don't need to: Eminence discounts your Dragons straight from the command zone.

Keep a hand that has both:

1. Mana plus acceleration — two-plus lands with a dork, a rock, or a land-ramp spell, ideally with green and red sources (your two most-demanded, slightly under-sourced colors). A cost reducer (Morophon, Sarkhan, Fist of Suns) counts double here. Between two otherwise equal hands, take the one accelerating on a rock or a land-ramp spell over the one leaning on a dork — the dorks are the piece that most often isn't there when you need it.
2. A payoff you can reach — early Dragons to cast, a cheat (Sneak Attack, Dracogenesis), a way to get Ur-Dragon attacking (Hellkite Courser), or a tutor to find one. A hand that ramps into nothing just durdles.

Snap-keep the explosive openers: fast mana into a cost reducer into a Dragon chain; a Sneak-Attack/Dracogenesis "cheat a bomb turn three" hand; or the Entomb → Reanimate two-card line.

Mulligan all-lands, all-Dragons-no-mana, green/red-light hands, and hands holding your top-end with no ramp, no discount, and no cheat to deploy it. Free protection or a combo piece in the opener is gravy — it changes how aggressively you jam, not whether you keep. Don't keep a hand whose only plan is "cast a nine-mana commander and hope"; keep the hand that starts attacking with cheap Dragons and lets the trigger snowball from there.

Game Plan

The arc is ramp → cheap Dragons → attack and snowball, with combat or a combo as the finish.

• Turns 1–3 (accelerate and reduce): mana dorks (Birds, Bloom Tender, Delighted Halfling), Sol Ring / Ancient Tomb / Arcane Signet, and land ramp (Nature's Lore, Three Visits, Skyshroud Claim). A cost reducer here is worth more than a body: Morophon (names Dragon — Dragons cost less), Sarkhan ( less and a copy engine), Rivaz (Dragon-only mana plus recasting Dragons from the yard), or Fist of Suns (pay for anything). Stacked with Eminence, your Dragons get absurdly cheap. Temper your expectations on the dorks, though — they are the weakest part of this curve. Birds, Bloom Tender, and Delighted Halfling all die to the exact thing a five-color deck with slow starts invites: the first board wipe, the stray ping, the Bowmasters. Treat them as a nice opener rather than the plan, and prefer the rocks and land-ramp (Sol Ring, Ancient Tomb, Arcane Signet, Nature's Lore, Three Visits, Skyshroud Claim) when a hand offers you the choice — that mana is still there after the wipe, and this deck rebuilds far better than it protects. Bloom Tender is the biggest of the three, but the slowest to turn on. It taps for one mana of each color among permanents you control, so on a developed five-color board it casts a Dragon by itself — but note what it actually reads: permanents you control. Ur-Dragon sitting in the command zone contributes nothing to its count. It's a payoff for a board you already have, not an opener that fixes a greedy hand.
• Midgame (deploy and start attacking): land Dragons and turn them sideways. The first attack is the important one — even a two- or three-Dragon swing draws cards and cheats a permanent, and from there you're ahead. Prioritize getting Ur-Dragon into play attacking (hardcast when you can afford it, or loop Hellkite Courser). Give the board haste where you can — Temur Ascendancy, Rhythm of the Wild (riot; also makes your creatures uncounterable), or Dragon Tempest (haste to fliers on entry) — so Dragons swing the turn they arrive instead of eating removal first. (Klauth has haste himself but doesn't grant it — and his attack mana is spells-only: it casts Dragons in your second main but can never pay Aggravated Assault's activation. Don't count it toward the loop.)
• Cheat toward the finish. Sneak Attack and Dracogenesis put your bombs in without paying full price; Entomb / Vampiric / Demonic / Worldly / Enlightened / Tiamat find whatever the turn needs; the reanimation suite (Reanimate, Living Death, Patriarch's Bidding, Phyrexian Reclamation, Colossal Grave-Reaver, Rivaz) buys back anything that dies or gets discarded. Entomb → Reanimate is a two-card line that puts a huge Dragon onto the battlefield on turn two.
• Close — by attacking. This is where the games actually end. With a wide board, Atarka (double strike to every attacking Dragon) usually just kills a player outright, and Dragon Tempest / Terror of the Peaks add the reach that finishes the rest. Keep half an eye on commander damage while you do it: a double-striking Ur-Dragon is 20 in one swing (22 under Morophon), so the player you've been hitting is often one attack from dead in a way the table hasn't noticed — a free extra out, not a plan to steer toward. The combos are the early endings, not the target — if you have lethal on board, take it instead of assembling. When an Aggravated Assault line does come together, it gives you free Ur-Dragon attacks each combat while it runs, which usually just accelerates the beatdown you were already winning with.

Sequencing tip: the combos want the mana-Dragon (Ventmaw/Gnawbone/Copper) already attacking, so a clean line is to swing with it, use Ur-Dragon's trigger to cheat Aggravated Assault into play, then activate Aggravated Assault in your postcombat main phase.

How The Ur-Dragon actually works

The commander is not vanilla, and one ruling reshapes how you sequence every attack. Internalize it — it's where the deck gets misplayed:

• The trigger fires when Dragons are declared as attackers, and the permanent you cheat in arrives not attacking. The trigger resolves after attackers are chosen, so the permanent enters after combat is already locked. Per the official ruling, you can't put a hasty creature in this way and then attack with it — and its own "whenever this attacks" abilities won't trigger this combat. This is the opposite of Kaalia, who puts creatures in already attacking.
• So what you cheat in matters. Cheat things whose value is on enter-the-battlefield or static, not creatures you're hoping to swing with right now:
  • Great cheats: Aggravated Assault, Dragon Tempest, Old Gnawbone (static), Terror of the Peaks, Ureni of the Unwritten and Colossal Grave-Reaver (their ETB puts another Dragon into play), Astral Dragon (ETB copies), or simply a huge body that swings next turn and grows the board now.
  • Do not cheat these expecting an immediate payoff: Atarka, Klauth, Savage Ventmaw — their triggers are on attacking, so a cheated copy sits inert until your next combat. And the dice-Dragons (Gold, Copper, Silver) pay off on combat damage, which a not-attacking creature can't deal — cheating Ancient Gold Dragon in does not set off its token combo. To fire those, you must actually attack with them (hardcast, or Sneak Attack them in with haste before combat so you can declare them).
• You cheat exactly one permanent per trigger, no matter how many Dragons attacked or how many players they hit. (Roaming Throne naming Dragon doubles the trigger — see Key Loops — which is how you cheat two.)
• You draw for every Dragon that attacked, even ones that die in combat before the trigger resolves.
• The engine needs Ur-Dragon on the battlefield; the discount doesn't. Eminence works from the command zone, so a keep never has to "get to nine mana" — it has to deploy cheap Dragons and start swinging. Hellkite Courser is the clean bridge: it puts Ur-Dragon in with haste, you attack for the draw-and-cheat, and it returns to the command zone at end step — no commander tax added. A repeatable Ur-Dragon attack for six mana.

Key Loops & Interactions

• The cheat rule governs the whole deck (see "How it works"). Cheat ETB/static value; attack with the creatures whose triggers need attacking or connecting. Tiamat is a special case: its five-Dragon tutor only fires "if you cast it," so Sneak-Attacking or cheating it in gets a 7/7 flyer and no tutor — hardcast Tiamat when you want the cards.
• Hellkite Courser = tax-free Ur-Dragon swings — the single best card in the deck that isn't the commander. Flicker the commander into play with haste, attack for the draw-and-cheat, hand it back to the command zone at end step with no tax increase. Your most repeatable access to the engine. Sneak Attack it in for and you get the same cheat-the-commander line a turn early — two Dragons attack, draw 2, drop a bomb.
• Morophon + Fist of Suns = free Dragons. Name Dragon with Morophon and its discount exactly cancels Fist of Suns' alternate cost, so every Dragon spell you cast is free. (Eminence adds nothing to this pair — it only trims generic mana, and the Fist cost has none — but Morophon alone still stacks with Eminence on hardcasts.) This is how you empty your hand in a single turn and go wide out of nowhere.
• Miirym doubles nontoken Dragons on entry. Every nontoken Dragon that enters — including ones you cheat off the Ur-Dragon trigger — makes a token copy, which doubles bodies and their ETB triggers (a Dragon Tempest ping fires for the original and the copy). The copies are tokens, so they don't re-trigger Miirym.
• Sneak Attack + Miirym is the value engine — you keep the copy. This pairing overperforms every time it shows up; if you see both, build the turn around it. Sneak Attack puts a Dragon in with haste, and because you do it before combat you can declare it as an attacker, so its attack triggers and combat-damage triggers all fire (unlike an Ur-Dragon cheat). With Miirym out, that Dragon entering also mints a token copy. Sneak Attack sacrifices only the creature it put in at end step — the Miirym token stays. So each activation buys a full combat out of a bomb and leaves a permanent Dragon behind. Even without Miirym, Sneak Attack is a fine "swing once, then bin it" outlet for a dice-Dragon or Ventmaw.
• Kokusho is the guaranteed-value sneak. Sneak Attack's end-step sacrifice is a bonus with Kokusho — buys a 5/5 flying swing and then a death trigger draining each opponent 5 and gaining you ~15, whether or not it ever connected. With Miirym out it gets better: the token copy is nonlegendary (Miirym strips the legend status), so it doesn't die to the legend rule — you keep a permanent second Kokusho, and its eventual death is another full drain. And every Living Death / Patriarch's Bidding that returns Kokusho re-arms the trigger — mass reanimation with Kokusho in the pile is 15 damage across the table before combat even starts.
• Living Death and Patriarch's Bidding buy back the sacrificed Dragons. Every creature Sneak Attack sacrifices (and everything that dies to a wipe or gets discarded to a Wheel) lands in your graveyard. Living Death and Patriarch's Bidding (name Dragon) then return the whole pile to the battlefield at once — turning a turn of sneaking bombs in for one swing each into a permanent board. Sneak a Dragon for its attack, let it die at end step, and reanimate it later for keeps. Icetill Explorer quietly feeds this whole package: its landfall self-mill stocks the graveyard while it ramps (extra land drop + lands playable from the yard), so your Living Death / Reanimate pile grows every turn without you spending a card on it.
• Astral Dragon and Sarkhan are extra copy engines. Astral Dragon's ETB makes two 3/3 flying Dragon copies of any noncreature permanent — copy Dragon Tempest for two more pingers, or any key enchantment — and each copy entering is another Dragon Tempest trigger. Sarkhan can become a copy of any Dragon that enters.
• Roaming Throne (name Dragon) doubles Dragon triggers — including Ur-Dragon's. Its attack trigger triggers twice: draw double and cheat two permanents. It also doubles the dice-Dragons' rolls and Old Gnawbone's Treasures. It does not double Dragon Tempest's pings — Throne only doubles triggers from creatures of the named type, and Tempest is an enchantment. Ward 2 keeps it sticky.
• The One Ring is two different cards — decide which one you're casting. Mode one: cast it and you gain protection from everything until your next turn — no damage to you, no targeting you — so the turn you tap out to commit the board, the crack-back hits a wall (your Dragons can still be blocked and killed; the Ring shields the player, not the board). Mode two: the burden-counter draw engine for the grind game — escalating draws each upkeep at 1 life per card. In a deck that taps out for a Dragon most turns, buy it for the protection window first; the draws are the consolation prize when the game goes long.
• Garruk's Uprising and Temur Ascendancy are the passive draw engines. Both draw you a card whenever a creature with power 4 or greater enters — which is nearly every Dragon you cast, cheat, copy, or reanimate — so mass entries (Living Death, Patriarch's Bidding, a Miirym copy) come with cards attached. Uprising also gives the whole team trample; Ascendancy's haste half is covered above.
• Terror of the Peaks turns every entry into burn, and it closes games you thought were even. It pings for each creature that enters — your cheats, your tokens, your copies, and (huge) every Faerie Dragon in the Gold Dragon line. Land it before a big deploy or the Dragon Tempest combo for a second wave of damage.
• Crux of Fate is your one-sided wipe. "Destroy all non-Dragon creatures" clears the table and leaves your Dragons — tokens included — intact. Reset a bad board, then rebuild faster than anyone.
• Wheel effects + reanimation. Wheel of Fortune and Windfall refill your hand (Ancient Silver Dragon removes your max hand size entirely); the Dragons you discard become Reanimate / Living Death / Patriarch's Bidding targets. Living Death and Patriarch's Bidding are mass reanimation after a wipe or a self-mill.
• Protection for the turn that matters. Fierce Guardianship and Deflecting Swat are free with the commander available; Teferi's Protection saves you from a lethal turn; Dragonlord Dromoka stops opponents casting anything on your turn (uncounterable, lifelink) — deploy it before a combo or alpha strike so nothing interrupts it. Rhythm of the Wild makes your creature spells uncounterable. Cavern of Souls naming Dragon does that job from turn one at no card cost — its any-color mana casts an uncounterable Dragon, and unlike Rhythm it's a land, so it never competes with your deploys. Counting Delighted Halfling (its mana makes legendary spells uncounterable, and a dozen Dragons here are legendary), you have four independent routes through a blue deck: Cavern, Halfling, Rhythm, and Dromoka. Line one up before the turn you tap out — the tables that actually beat this deck are the ones holding interaction for your commitment turn.
• Colossal Grave-Reaver + Scion of the Ur-Dragon. Grave-Reaver is a house — one of the deck's most reliable overperformers, and worth cheating off the Ur-Dragon trigger ahead of almost anything else: a self-mill reanimator that mills 3 on entry and on attack, and any creature milled from your library goes straight onto the battlefield. That turns Scion of the Ur-Dragon into a tutor-to-play engine — Scion's puts a Dragon into your graveyard (which Grave-Reaver immediately reanimates) and Scion becomes a copy of it, so one activation lands the real Dragon in play plus a second copy riding on Scion. Even without Grave-Reaver out, Scion tutors a Dragon to the yard (feeding reanimation) and can become Ventmaw or a dice-Dragon for the turn to jump-start a combo.

Combos

All four combos live in the list. The two below marked infinite are true loops; the two marked burst / near-infinite don't loop forever but a single average roll is a game-ending payload.

Dragon Tempest + Ancient Gold Dragon — burst kill (fuller treatment)

The signature nuke, and the reason to attack with Ancient Gold Dragon rather than cheat it in.

1. Attack with Ancient Gold Dragon and connect (it flies; usually unblocked). Its combat-damage trigger rolls a d20 and makes that many 1/1 flying Faerie Dragon tokens.
2. Every token is a Dragon, and they all enter at once — so each one triggers Dragon Tempest's second ability ("whenever a Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control").
3. X is counted as each trigger resolves, and all the tokens are already on the battlefield (ruling confirmed), so X is your full Dragon count for every one of those triggers.
4. Math: an average roll of 10 makes ~10 tokens; with Gold, Ur-Dragon, and a body or two you're near ~13 Dragons — 13 damage × 10 triggers = **130**, enough to clear a full table at once. A rolled 20 is ~420. Point the pings at faces, or split some onto blockers.

Not a loop, but one connect ends the game. It must connect — cheating Gold in via Ur-Dragon or Sneak Attack (with no attack) produces no combat damage and no tokens; you have to swing with it. Terror of the Peaks adds a ping per token entering — the Faeries are 1/1s, so that's ~10 extra damage, not a doubling — and Roaming Throne naming Dragon rolls the d20 twice.

Savage Ventmaw + Aggravated Assault — infinite combats (fuller treatment)

The cleanest engine in the deck, because it keys off attacking, not connecting.

1. Declare Savage Ventmaw as an attacker. Its trigger adds — six mana — and that mana persists through phase changes. Ventmaw does not need to connect or be unblocked to make the mana — it only needs to be declared. However, Ventmaw must survive combat so you can declare it as an attacker again in the extra combat step. If a blocker kills it, the loop breaks.
2. In your postcombat main phase, pay for Aggravated Assault: untap all your creatures and get an extra combat phase followed by an extra main phase.
3. Attack again — declare Ventmaw, add six more mana, net +1. Repeat for infinite combats, infinite attacks, and arbitrarily large mana.

The loop, at a glance:

Every extra combat is another Ur-Dragon attack trigger (draw a fistful, cheat a permanent), and with Atarka out the board hits for double. Infinite combats plus even a small Dragon team is lethal across the table.

Old Gnawbone + Aggravated Assault — infinite combats

Old Gnawbone: "whenever a creature you control deals combat damage to a player, create that many Treasures." Attack and connect for at least 5 combat damage → at least 5 Treasures → crack them for → Aggravated Assault untaps and grants an extra combat → repeat. At exactly 5 damage it's mana-neutral (infinite combats); every point over 5 is surplus Treasure/mana. This one requires connecting — Gnawbone is a 5/5 flyer, so it alone getting through sustains the loop, and any other attacker's damage adds Treasures too.

Ancient Copper Dragon + Aggravated Assault — near-infinite combats

Ancient Copper Dragon: on combat damage to a player, roll a d20 and make that many Treasures (avg ~10). Crack 5 for → Aggravated Assault → extra combat → Copper connects again for more Treasures. It averages ~+5 Treasures per loop, so it runs away — "near-infinite" because a cold run of low rolls with no banked Treasures could stall. Copper flies, so connecting is rarely a problem, and surplus Treasures bankroll the rest of your turn.